HYDRAULIC SYSTEM

Abstract

A hydraulic system includes a reservoir for a hydraulic fluid, a pump, a high-pressure line network, a low-pressure line network and operating cylinders each of which can be connected to the high-pressure line network or to the low-pressure line network via control units, each operating cylinder is associated with a local compensation volume element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will be described below making reference to the accompanying drawings. The drawings show the following:

FIG. 1—a first fundamental embodiment of a hydraulic system according to the invention, with two operating cylinders;

FIG. 2—a hydraulic system as shown in FIG. 1, except with the modification that a pressure accumulator is provided for one operating cylinder; and

FIG. 3—a conventional hydraulic system according to the state of the art.

Claims

1. A hydraulic system comprising: a reservoir for a hydraulic fluid;a pump;a high-pressure line network;a low-pressure line network;a first operating cylinder having a first operating piston and connectable to the high-pressure line network and the low-pressure line network via a first control unit;a second operating cylinder having a second operating piston and connectable to the high-pressure line network and the low-pressure line network via a second control unit;at least one local compensation volume element associated with a respective one of the first and second operating cylinders, the local compensation volume element adapted to compensate for a differential volume between a high-pressure side and a low pressure side of the respective first or second operating cylinder, and having a compensation space and a compensation operating piston disposed movably in the compensation space; anda mechanical connection coupled to the compensation operating piston and couplable to the respective one of the first and second operating pistons and configured to actuate the compensation volume element for accommodating and releasing the differential volume.

2. The hydraulic system as recited in claim 1, wherein the at least one local compensation volume element includes first and second local compensation volume elements, each associated with one of the first and second operating cylinders.

3. The hydraulic system as recited in claim 1, wherein the mechanical connection includes an elongated piston rod that extends from the respective one of the first or second operating cylinders and is connected to the respective compensation operating piston of the respective compensation volume element.

4. The hydraulic system as recited in claim 1, wherein the mechanical connection includes a piston rod of the first or second operating cylinder that concurrently constitutes a piston rod of the compensation operating piston of the compensation volume element.

5. The hydraulic system as recited in claim 4, wherein the local compensation volume element is disposed coaxially with at least one of the first and second operating cylinders with which it cooperates.

6. The hydraulic system as recited in claim 4, wherein the local compensation volume element is disposed on at least one of the first and second operating cylinders.

7. The hydraulic system as recited in claim 4, wherein the local compensation volume element is configured at least partially as a component of at least one of the first and second operating cylinders.

8. A hydraulic system comprising: a reservoir for a hydraulic fluid;a pump;a high-pressure line network;a low-pressure line network;a first operating cylinder having a first operating piston and connectable to the high-pressure line network and the low-pressure line network via a first control unit;a second operating cylinder having a second operating piston and connectable to the high-pressure line network and the low-pressure line network via a second control unit;a pressure accumulator having an accumulator operating piston and a useful piston displacement greater than a piston displacement of the second operating cylindera shared local compensation volume element associated with the second operating cylinder and adapted to accommodate differential volumes between a high-pressure side and a low pressure side of the second operating cylinder and of the pressure accumulator, the compensation volume element having a compensation space and a compensation operating piston disposed movably in the compensation space; anda mechanical connection coupled to the compensation operating piston, couplable to the accumulator operating piston and configured to actuate the compensation volume element for accommodating and releasing the differential volume

9. The hydraulic system as recited in claim 8, wherein the shared compensation volume element forms a partial area of the pressure accumulator.

10. The hydraulic system as recited in claim 8, wherein the mechanical connection includes an elongated piston rod that extends from the pressure accumulator and is connected to the compensation operating piston of the compensation volume element.

11. The hydraulic system as recited in claim 8, wherein the mechanical connection includes a piston rod of the accumulator operating piston that concurrently constitutes a piston rod of the compensation operating piston of the compensation volume element.

12. The hydraulic system as recited in claim 8, wherein the local compensation volume element is disposed coaxially with the pressure accumulator.

13. The hydraulic system as recited in claim 8, wherein the local compensation volume element is disposed on the pressure accumulator.

14. The hydraulic system as recited in claim 8, wherein the local compensation volume element is configured at least partially as a component of the pressure accumulator.